Furnace-port construction



Nov. 12, 1929. 1 N. MCDONALD FURNACE PORT CONSTRUCTION Filed Oct. 27.' 1921 3 Sheets-Sheet Nav; 12, 1929.

L.' N. MDoNALD FUHNACE PORT CONSTRUCTION Filed Occ.-- 27, 1921 3 Sheets-Sheet 2 Wnessas:

Patented Nov. 12, 1929 PATENT OFFICE LOUIS N. MCDONALD, OFYOUNGSI'OWN, OHIO FURNACE-PORT CONSTRUCTION Application nled October 27, 1921. Serial No. 510,822.

This invention relates ,to regenerative furnaces of the open hearth type and has particular reference to the air and gas ports of such furnaces.

The object of the invention is to arrange the air and gas ports of furnaces of this type so that the gas will enter the furnace through two or more ports inclined inwardly toward each other on an angle to the longitudinal axis of the furnace while the air will enter the furnace through a central port parallel with the longitudinal axis of the furnace,

'thereby causing the gas to cross the hearth of the furnace diagonally while the air fiows parallel to the longitudinal axis yof the furnace providing a thorough mixture of the air and gas and giving an increased iame temperature.

Another advantage, due to the angularly disposed gas ports, is that the two ames from the gas ports meet at an angle, and tend to ull the air down into the gas flame.

till another advantage is that the gas being divided into two 0r more streams causes greater eX osure of gas surface to the air, thereby allowing better flame control and permitting the burning of a given amount of gas with a minimum of excess air.

Referring to the drawings: Figure 1 is a. sectional elevation of a furnace embodying my invention.

Figure 2 is a sectional plan view of the furnace on the line II-II of Figure 1.

Figure 3 is a cross sectional elevation on thefline III-III of Figure 1.

Referring more particularly to the drawings, the furnace consists of the usual base 2, side and end Walls 3 and 4, top 5, and hearth 6.

The usual slag pockets 7 and 8 are located at the ends of the furnace and are adapted to be connected in the usual manner to the air and gas regenerators, respectively.

Suitable gas ports 9 and 10 extend from the end of the furnace at each side thereof in the form of tunnels or arches and are inclined or directed inwardly on an angle so that their center'lines will intersect at a point over the hearth 6.

The ports 9 and 10 are connected at theirl rear ends by vertical flues 11 and 12 with Athe furnace at one end, the products of comthe slag pocket 8. The bottom wall 13 of the ports 9 and 1() is inclined downwardly toward the discharge end, and the top wall 14 is inclined downwardly toward the discharge end at a greater angle than the bottom wall, t-hus forming av somewhat contracted discharge opening and forcing the gas to discharge downwardly on an angle.

The space between the gas ports 9 and 10 is built up to form an air port 15, the bottom wall 16 of which is formed concave or dished and is on a considerably higher plane than the bottom walls 13 of the gas ports 9 and 10.

The air port 15 is connected at its rear end by a flue 17 with the slag pocket 7.

The furnace is of duplicate construction at each end so that the firing of the furnace may be reversed as is the usual practice in regenerative furnaces, that is, during the firing of bustion will .pass through the gas ports 9 and 10, and air port 15 at the other end, through the vertical iues 11, 12, and 17 to the slag pockets? and 8, thence through the regenerator chambers for that-end to the stack, thus heating the re'generator chambers. When the furnace is reversed, the air and gas will flow through the regenerator chambers previously heated to the gas and air ports of that end, while the products of combustion will pass out through the gas and air ports at the opposite end.

In the operation of a furnace embodying this invention, the gas will be ejected out of the angularlyldisposed norts 9 and 10 '1n stream lines that are directed downwardly and inwardly on such an angle that they will meet at a point` over the hearth 6. The gas i nites as it leaves the ports 9 and 10 and t e gas thus ignited, traveling in its angular path, serves to draw downthe air {iowing from the higher air port 15, which air is also directed downwardly by the shape of the air port 15. l

The formation of two separate gas or flame 95 bodies provides for greater surface contact with the air, and since the gas or fiame bodies intersect or cross the air flow pathl a thorough mixing of theair and gas take place, thus providing for more perfect combustion..

The gas ports 9 and 10 are more accessible than the gas ports of furnaces heretofore constructed since they are located in the corners of the furnace.

Suitable bulk heads areprovided through which access may be had to the gas ports, and the size of the ports may be varied during operation by building up the port at the bottom with chrome ore ornmagnesite.

By building up one or the other of the gas ports 9 or l0, the volume of gas going out of the built up or throttled port is reduced, while the volume going out of the other port is correspondingly increased, thereby governing the direction of the gas flame across the hearth.

While I have shown only one specific embodiment of my invention. it will be understood that I do not wish to'be limited to such" specific embodiment, since various modifications, that may be made without departing from the spirit of my invention as defined in the appended claim, will readily suggest themselves to those skilled in the art.

I claim In a reversible regenerative furnace, a plurality of fuel ports, an air uptake located intermediate said ports, said air uptake terminating in an air port extending above and intermediate the fuel ports.

In testimony whereof, I have hereunto y signed my name.

LOUIS N. MCDONALD. 

